Investments (Net realized investment gains (losses)) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Fixed maturity securities:
Gross gains	$ 48	$ 75	$ 120
Gross losses	(150)	(166)	(261)
Net investment gains (losses) on fixed maturity securities	(102)	(91)	(141)
Equity securities	21	4	(116)
Derivatives	0	(1)	64
Mortgage loans	0	(11)	(8)
Short-term investments and other	0	0	2
Net investment gains (losses)	$ (81)	$ (99)	$ (199)